Use default :edit routing (#14535)

config/routes.rb

@@ -171,11 +171,7 @@ Rails.application.routes.draw do
     get '/dashboard', to: 'dashboard#index'
 
     resources :domain_allows, only: [:new, :create, :show, :destroy]
-    resources :domain_blocks, only: [:new, :create, :show, :destroy, :update] do
+    resources :domain_blocks, only: [:new, :create, :show, :destroy, :update, :edit]
-      member do
-        get :edit
-      end
-    end
 
     resources :email_domain_blocks, only: [:index, :new, :create, :destroy]
     resources :action_logs, only: [:index]